Rob McElhenney and Glenn Howerton in It's Always Sunny in Philadelphia (2005)

Danny DeVito, Rob McElhenney, Kaitlin Olson, and Glenn Howerton in It's Always Sunny in Philadelphia (2005)

Danny DeVito, Rob McElhenney, and Glenn Howerton in It's Always Sunny in Philadelphia (2005)

Kaitlin Olson and Glenn Howerton in It's Always Sunny in Philadelphia (2005)

Danny DeVito, Kaitlin Olson, and Glenn Howerton in It's Always Sunny in Philadelphia (2005)

Glenn Howerton in It's Always Sunny in Philadelphia (2005)

Danny DeVito, Charlie Day, Rob McElhenney, Kaitlin Olson, and Glenn Howerton in It's Always Sunny in Philadelphia (2005)

Charlie Day and Glenn Howerton in It's Always Sunny in Philadelphia (2005)

Danny DeVito, Charlie Day, and Glenn Howerton in It's Always Sunny in Philadelphia (2005)

David Hornsby, Rob McElhenney, and Glenn Howerton in It's Always Sunny in Philadelphia (2005)

Charlie Day, Rob McElhenney, and Glenn Howerton in It's Always Sunny in Philadelphia (2005)

Glenn Howerton in The Mindy Project (2012)

Jesse Peretz, Glenn Howerton, and Chris O'Dowd at an event for Juliet, Naked (2018)

Glenn Howerton, Meghann Fahy, and Milly Alcock in Sirens (2025)

Glenn Howerton in Under a Rock with Tig Notaro (2019)

Paula Pell and Glenn Howerton in A.P. Bio (2018)

Reba McEntire, Glenn Howerton, and Lucy Hale in The Late Late Show with James Corden (2015)

Glenn Howerton and Jessica Garza in A.P. Bio (2018)

Charlie Day, Kaitlin Olson, and Glenn Howerton in It's Always Sunny in Philadelphia (2005)

Rob McElhenney, Kaitlin Olson, and Glenn Howerton in It's Always Sunny in Philadelphia (2005)

Charlie Day, Rob McElhenney, Kaitlin Olson, and Glenn Howerton in It's Always Sunny in Philadelphia (2005)

Patton Oswalt, Glenn Howerton, Mary Sohn, Vanessa Bayer, Lyric Lewis, Aparna Brielle, Nick Peine, and Jacob McCarthy in A.P. Bio (2018)

Glenn Howerton, Steve Little, and Ben Schwartz in Coffee Town (2013)

Jason Statham, Earl Carroll, Glenn Howerton, Brian Swibel, and Donnie Smith in Crank (2006)

Brittany Daniel, Tinsley Grimes, Chyler Leigh, Geoff Pierson, Margaret Smith, Glenn Howerton, and Eddie Shin in That '80s Show (2002)